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Old 10-09-2019, 11:32 PM   #1
Gotthebug
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Default Whats that noise?

https://www.dropbox.com/s/xqxmmghw2u...47231.mp4?dl=0

Any ideas whats causing this noise. Recently started. Was getting popping when backing off so tried changing mixture. Took out plug and looks like its running lean. Also running V hot.

Ideas?
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Old 11-09-2019, 10:33 AM   #2
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Change the mixture back as that'll be why it's running lean. The noise sounds like something wrong with the coil or dizzy as has a high pitch electrical sound to it.

Backfiring can also be caused by ignition timing so I'd start with the ignition stuff first.
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Old 11-09-2019, 09:10 PM   #3
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Well, had a look inside the dizzy and it looks like its got a bit of corrosion inside. Is this salvagable? Can you get these refurbed or get refurb kits? Looks like contacts in cap are worn too.

https://www.dropbox.com/s/wsvbcnq6fm..._0020.JPG?dl=0



The noise seems to be louder on the left side and is as loud underneath so would that be the case if it was electrical?

On the subject of the 8485 dizzy, how to you find TDC with it as only done the rocker cover gaps with a 007 where I used the rotor arm to find TDC (a long time back so very rusty).

Appreciate the help chaps
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Old 11-09-2019, 10:08 PM   #4
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That is a lot of corrosion,and the rusty rotor shaft might well be the source of the squeaking as it tries to turn and fight the rust. Though i agree the noise has an electrical pitch to it,so i'm sitting on the fence
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Old 11-09-2019, 10:52 PM   #5
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Had something very similar - Intake leak between head and manifold making a chirping sound at tickover. Sound stopped slightly above tickover because the vacuum level changes when the throttles open.


Caused by wonky aftermarket manifold - Not flat on the ends so flatted them, ditched the tin gaskets for homemade ones cut from thin cardboard and problem solved.


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Old 11-09-2019, 11:01 PM   #6
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Dont have a gasket as the heads are ported so used gasket sealant.
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Old 13-09-2019, 10:20 AM   #7
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Quote:
Originally Posted by Gotthebug View Post
Dont have a gasket as the heads are ported so used gasket sealant.
Mating faces still need to be flat as all the pressure acts on the one spot that isn't flat. Doesn't matter if you use sealant or a gasket. It'll find it's way to atmosphere.
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Old 19-09-2019, 04:11 PM   #8
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I'd put money on it being an intake leak or (more unlikely) carb leak - check all the core plugs too, but I have only seen one of these fail in 44 years...
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Old 20-09-2019, 10:08 AM   #9
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I used to have a chirping carb but nothing like as loud as that. Are you sure it's not the engine rubbing on the skirt rubber or something they can be tight.
Are you running a power pulley on the road?
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